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URN: urn:nbn:de:kobv:517-opus-14959
URL: http://opus.kobv.de/ubp/volltexte/2007/1495/


Zakharov, Venjamin E. ; Meister, Claudia-Veronika

Acceleration and heating in the auroral magnetosphere by current driven electrostatic ion cyclotron turbulence

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Kurzfassung in Englisch

A numerical MHD model is developed to investigate acceleration and heating of both thermal and auroral plasma. This is done for magnetospheric flux tubes in which intensive field aligned currents flow. To give each of these tubes, the empirical Tsyganenko model of the magnetospheric field is used. The parameters of the background plasma outside the flux tube as well as the strength of
the electric field of magnetospheric convection are given. Performing the numerical calculations, the distributions of the plasma densities, velocities, temperatures, parallel electric field and current, and of the coefficients of thermal conductivity are obtained in a self-consistent way. It is found that EIC turbulence develops effectively in the thermal plasma. The parallel electric field develops under the action of the anomalous resistivity. This electric field accelerates both the thermal and the auroral plasma. The thermal turbulent plasma is also subjected to an intensive heating. The increase of the plasma of the Earth's ionosphere. Besides, studying the growth and dispersion properties of oblique ion cyclotron waves excited in a drifting magnetized plasma, it is shown that under non-stationary conditions such waves may reveal the properties of bursts of polarized transverse electromagnetic waves at frequencies near the patron gyrofrequency.

Institut: Interdisziplinäres Zentrum Dynamik komplexer Systeme
DDC-Sachgruppe: Physik
Dokumentart: c Preprint (Vorabdruck)
Schriftenreihe: NLD Preprints
Bandnummer: paper 059
Sprache: Englisch
Erstellungsjahr: 2000
Publikationsdatum: 15.08.2007


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